This piece is a sound sculpture consisting of 8 tweeters and an 8 channel amplifier.

The music that it playes contains no spectral energy below 10kHz. It inhabits the border of human perception.

The percieved sound depends very much on room acoustics, head position and the condition of the listeners auditory system. Parents will hear less of the sound than their children and drummers will probably hear a lot less than librarians.

The compositions are about light and the design of the sculpture reflects this in the bright, fresh, green color and in the "beams" on which the tweeters are mounted.